![]() ![]() A long message, such as a detailed CYRIL report, can be sent in just over four seconds. Not only that, with some of the wider band modes available, its transmission time is incredibly fast. And because it gets very little use in these bands, most folks won’t know what it is if/when they hear it. ![]() FLDigi is normally thought of only for HF radio, but it has a lot of uses on VHF and UHF as well. Either a digital handheld radio, normally a DMR, D-Star or Fusion, or one of the many modes found in a free program called FLDigi. For most, one of two things will come to mind here. So that points us in the direction of digital communications. After all, exploitation is the primary goal of intelligence- how can I use what I’ve collected against an enemy? Students in my Signals Intelligence course have learned exactly how dangerous that can be, creating a massive amount of confusion in a short period of time. But most importantly, the largest drawback of using your own voice over the radio is that if a sophisticated opponent is monitoring you, they now have a voice to record and exploit. Transmitting a long message can take some serious time, is susceptible to interference and/or jamming, and also might not be understood on the other end. First and foremost, in keeping with the basic principles of clandestine radio communications for guerrilla groups, we’ve got to keep our time on the mic short and transmitting power low, and if at all possible, using a directional antenna such as my small UHF Yagi on a simple camera tripod. ![]()
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